Re: Help please! To track down GC trying to free an already freed object.

[Alan Mackenzie]

Hello, Eli.

On Tue, Apr 02, 2019 at 22:21:26 +0300, Eli Zaretskii wrote:
> > Date: Tue, 2 Apr 2019 12:09:59 -0700
> > From: "Daniel Colascione" <address@hidden>
> > Cc: address@hidden
> > 
> > rr is incredibly helpful for debugging this sort of problem. See
> > https://rr-project.org/. You can record an rr session containing the
> > crash, replay it, get to the crash, and then reverse-next, reverse-finish,
> > and reverse-continue your way through the GC, running it in reverse until
> > you find whatever it is that made mark_object on the dead object happen.

> GDB supports reverse execution as well, on some platforms.

On my GNU/Linux system, I tried to run 'reverse-next', and got the error
message:

    Target multi-thread does not support this command.

.  :-(  I suppose I could reconfigure without multi threading, but then
the bug (which is reproducible) probably wouldn't happen in the same
place.

-- 
Alan Mackenzie (Nuremberg, Germany).